/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  color: #333;
  line-height: 1.5;
  background-color: #f5f5f5;
}

a {
  text-decoration: none;
  color: #333;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  vertical-align: middle;
}

/* 公共类 */
.clearfix::after {
  content: '';
  display: table;
  clear: both;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.text-left {
  text-align: left;
}

/* 布局类 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 6px 12px;
  margin-bottom: 0;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.42857143;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 4px;
}

.btn-primary {
  color: #fff;
  background-color: #1890ff;
  border-color: #1890ff;
}

.btn-primary:hover {
  background-color: #40a9ff;
  border-color: #40a9ff;
}

/* 表单元素 */
.form-control {
  display: block;
  width: 100%;
  height: 34px;
  padding: 6px 12px;
  font-size: 14px;
  line-height: 1.42857143;
  color: #555;
  background-color: #fff;
  background-image: none;
  border: 1px solid #d9d9d9;
  border-radius: 4px;
  transition: border-color ease-in-out .15s, box-shadow ease-in-out .15s;
}

.form-control:focus {
  border-color: #40a9ff;
  outline: 0;
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.2);
}

/* 卡片样式 */
.card {
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

.card-header {
  padding: 15px;
  border-bottom: 1px solid #f0f0f0;
  font-size: 16px;
  font-weight: bold;
}

.card-body {
  padding: 15px;
}